L10 Flashcards
(17 cards)
Dynamic MFA
Material flows analysis applied over a timescale.
Scenario Vs Forecast
A plausible outcome based on logic Vs a predicted outcome based on data.
Survival Function
The probability a stock is present at time t.
Cohort
The materials/products that were added to the stock in the same year.
Service
a system supplying a need
3 differences between service and design life, the effect of this on dynamic MFA
Design life is forecast life expectancy based on design (theoretical, expected conditions), while service is based on real world results (data experience, actual conditions). Actual conditions often worse (humans are optimists), therefore product lifetime is shorter and the in-use stock is less.
What term of the IPAT is constant in business as usual?
T
Difference between a Cohort and Model year
Cohort a the group of products made in the same year, Model year is the stock at that given year.
What does the Cohort matrix diagonal represent?
The year that that cohort of materials/products was produced.
Flow Driven Model
Used when demand and product lifetime distributions are known. Calculates stock at time t.
Stock Driven Model
Used when initial stock and product lifetime distributions are known. Calculates stock at time t.
Lifetime Distribution
The probability density function that materials/products leave the in-use stock at time t.
Relationship between Cohort/lifetime distribution and survival function.
The life time distribution is 1 - the derivative of the survival function.
Storyline
Concise description of how a scenario may be realised.
What is included in the 3 aspects of Class 3 models.
Driving forces (Human - food, energy, healthcare, housing, education, transport)
System
Environmental Impact
What Industrial Ecology methods are coupled for class 3 models, difficulties of this.
MFA, LCA. Difficult because LCA is normally small scale.
In-use Stock
Material Inflows - Outflows
